556
FNCA52 TJSJ 120913
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
513 AM AST MON JAN 12 2026
DISCUSSION
KBDI VALUES IN CABO ROJO ARE AROUND 594, WHILE IN CAMP SANTIAGO,
THEY ARE AROUND 536. DAYTIME MINIMUM RH VALUES ARE EXPECTED TO
DROP NEAR CRITICAL VALUES THIS AFTERNOON; HOWEVER, WE EXPECT
SHOWER ACTIVITY TO FORM OVER THE WESTERN INTERIOR AND SOME MAY
REACH THE SOUTHWEST QUADRANT AT TIMES. ADDITIONALLY, E TO NE
WINDS WILL RANGE BETWEEN 10 AND 16 MPH WITH HIGHER GUSTS DUE TO
SEA BREEZE VARIATIONS. WINDS ARE EXPECTED TO SHIFT TO EAST-
SOUTHEAST FROM WEDNESDAY THROUGH FRIDAY. THIS WILL FAVOR DRIER
CONDITIONS, WITH POCKETS OF BELOW-NORMAL MOISTURE POSSIBLE DURING
PEAK FIRE WEATHER HOURS. WE ENCOURAGE THE FIRE-WEATHER COMMUNITY
TO MONITOR THE DRYING TREND, AS CONDITIONS COULD WORSEN IF NO
RAINFALL OCCURS OVER THESE LOCATIONS.
PRZ014-130915-
SOUTHEAST COASTAL PLAINS-
513 AM AST MON JAN 12 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 40 0
TEMP (24H TREND) 86 (+1) 67 (-2) 87
RH % (24H TREND) 53 (-3) 95 (+4) 55
WIND 20FT/EARLY(MPH) E 14 G19 NE 11 E 14 G20
WIND 20FT/LATE(MPH) E 14 G19 NE 11 E 14 G20
MIXING HGT(FT-AGL/MSL)4310 5240
TRANSPORT WND (MPH) E 9 E 12
VENT RATE (KT-FT) 34480 52400
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-130915-
SOUTHERN HILLS-
513 AM AST MON JAN 12 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 20 30
TEMP (24H TREND) 82 (+2) 64 (-3) 83
RH % (24H TREND) 65 (-4) 98 (+5) 61
WIND 20FT/EARLY(MPH) E 11 NE 10 E 11
WIND 20FT/LATE(MPH) E 11 NE 10 E 11
MIXING HGT(FT-AGL/MSL)4580 5910
TRANSPORT WND (MPH) E 8 E 9
VENT RATE (KT-FT) 32060 47280
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-130915-
NORTH COASTAL PLAINS-
513 AM AST MON JAN 12 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 30 20
TEMP (24H TREND) 85 (+1) 67 (-2) 85
RH % (24H TREND) 65 (-3) 100 (+2) 61
WIND 20FT/EARLY(MPH) E 16 E 14 E 14
WIND 20FT/LATE(MPH) E 16 E 14 E 14
MIXING HGT(FT-AGL/MSL)4230 5170
TRANSPORT WND (MPH) E 13 E 10
VENT RATE (KT-FT) 46530 46530
DISPERSION 5 5
DSI 5 5 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-130915-
NORTHERN HILLS-
513 AM AST MON JAN 12 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 20 10
TEMP (24H TREND) 83 (+1) 65 (-2) 83
RH % (24H TREND) 65 (-3) 99 (+2) 59
WIND 20FT/EARLY(MPH) NE 13 E 12 NE 12
WIND 20FT/LATE(MPH) NE 13 E 12 NE 12
MIXING HGT(FT-AGL/MSL)4300 6460
TRANSPORT WND (MPH) E 12 E 7
VENT RATE (KT-FT) 43000 38760
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-130915-
WEST COAST-
513 AM AST MON JAN 12 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 80 40 50
TEMP (24H TREND) 86 (+1) 66 (-2) 86
RH % (24H TREND) 62 (-5) 99 (+3) 59
WIND 20FT/EARLY(MPH) E 12 E 16 E 10
WIND 20FT/LATE(MPH) E 12 E 16 E 10
MIXING HGT(FT-AGL/MSL)3860 4460
TRANSPORT WND (MPH) E 8 SE 5
VENT RATE (KT-FT) 27020 17840
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-130915-
EASTERN INTERIOR-
513 AM AST MON JAN 12 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 70 40 30
TEMP (24H TREND) 83 (+2) 65 (-3) 83
RH % (24H TREND) 67 (-1) 99 (+1) 63
WIND 20FT/EARLY(MPH) E 10 E 10 E 10
WIND 20FT/LATE(MPH) E 10 E 10 E 10
MIXING HGT(FT-AGL/MSL)4870 5870
TRANSPORT WND (MPH) E 9 E 10
VENT RATE (KT-FT) 38960 52830
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-130915-
LUQUILLO MOUNTAIN RANGE-
513 AM AST MON JAN 12 2026
TODAY TONIGHT TUE
CLOUD COVER MCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 70 50 40
TEMP (24H TREND) 79 (+2) 64 (-3) 79
RH % (24H TREND) 71 (-2) 100 (0) 68
WIND 20FT/EARLY(MPH) E 9 E 8 E 9
WIND 20FT/LATE(MPH) E 9 E 8 E 9
MIXING HGT(FT-AGL/MSL)3990 4350
TRANSPORT WND (MPH) E 9 E 12
VENT RATE (KT-FT) 31920 43500
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-130915-
CENTRAL MOUNTAIN RANGE-
513 AM AST MON JAN 12 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 80 0 50
TEMP (24H TREND) 81 (+3) 62 (-3) 81
RH % (24H TREND) 65 (-5) 100 (+3) 60
WIND 20FT/EARLY(MPH) E 9 E 12 E 8
WIND 20FT/LATE(MPH) E 9 E 12 E 8
MIXING HGT(FT-AGL/MSL)4580 7430
TRANSPORT WND (MPH) E 8 SE 5
VENT RATE (KT-FT) 32060 29720
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-130915-
CAYEY MOUNTAIN RANGE-
513 AM AST MON JAN 12 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 20
TEMP (24H TREND) 78 (+1) 64 (-2) 78
RH % (24H TREND) 73 (+1) 100 (+1) 69
WIND 20FT/EARLY(MPH) E 9 NE 8 E 10
WIND 20FT/LATE(MPH) E 9 NE 8 E 10
MIXING HGT(FT-AGL/MSL)4570 5150
TRANSPORT WND (MPH) E 10 E 13
VENT RATE (KT-FT) 41130 56650
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-130915-
VIEQUES-
513 AM AST MON JAN 12 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 10
TEMP (24H TREND) 85 (0) 70 (-2) 85
RH % (24H TREND) 60 (0) 96 (0) 58
WIND 20FT/EARLY(MPH) E 11 E 12 E 12
WIND 20FT/LATE(MPH) E 11 E 12 E 12
MIXING HGT(FT-AGL/MSL)3500 3710
TRANSPORT WND (MPH) E 12 E 13
VENT RATE (KT-FT) 35000 40810
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-130915-
CULEBRA-
513 AM AST MON JAN 12 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 30 20
TEMP (24H TREND) 85 (0) 72 (-1) 85
RH % (24H TREND) 60 (-3) 90 (-4) 59
WIND 20FT/EARLY(MPH) E 11 E 12 E 12
WIND 20FT/LATE(MPH) E 11 E 12 E 12
MIXING HGT(FT-AGL/MSL)3450 3650
TRANSPORT WND (MPH) E 12 E 13
VENT RATE (KT-FT) 34500 40150
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-130915-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
513 AM AST MON JAN 12 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 50 20
TEMP (24H TREND) 87 (+2) 66 (-3) 88
RH % (24H TREND) 53 (-2) 96 (+7) 54
WIND 20FT/EARLY(MPH) E 12 E 17 E 13 G19
WIND 20FT/LATE(MPH) E 12 E 17 E 13 G19
MIXING HGT(FT-AGL/MSL)4160 4680
TRANSPORT WND (MPH) E 7 E 9
VENT RATE (KT-FT) 24960 37440
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-130915-
SAINT THOMAS AND SAINT JOHN-
513 AM AST MON JAN 12 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 10 10
TEMP (24H TREND) 85 (+1) 71 (-3) 85
RH % (24H TREND) 59 (-6) 93 (-2) 58
WIND 20FT/EARLY(MPH) E 10 E 13 E 12
WIND 20FT/LATE(MPH) E 10 E 13 E 12
MIXING HGT(FT-AGL/MSL)3450 3690
TRANSPORT WND (MPH) E 13 E 15
VENT RATE (KT-FT) 37950 47970
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-130915-
ST CROIX-
513 AM AST MON JAN 12 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 30 10
TEMP (24H TREND) 86 (+1) 72 (-1) 86
RH % (24H TREND) 61 (-3) 92 (0) 60
WIND 20FT/EARLY(MPH) E 10 E 12 E 12
WIND 20FT/LATE(MPH) E 10 E 12 E 12
MIXING HGT(FT-AGL/MSL)4260 4680
TRANSPORT WND (MPH) E 10 E 15
VENT RATE (KT-FT) 38340 60840
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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